I have a PS3 and Xbox 360 (and a Wii), as well as a PC, and I chose the PC version for control preference reasons. I'm not fussed about the graphics being better in the PC version, but that is a bonus I suppose.
For the record, I didn't have any major problems with the game, and I really enjoyed it. Nevertheless I have been quite outspoken about the problems others have had, and are still having, with the game (on the US Dead Space EA forums). Releasing the game in a state where so many people have little chance of playing and/or enjoying it is bad enough, but to fail to address these technical issues - six months on, and counting - is totally unacceptable.